Please post only one question at a time.
I will help you solve the first problem.
Square both sides:
Only one solution will work in this case
EDIT: DivideBy0 pointed out a spot that wouldn't work, which I suspected... grr
Please post only one question at a time.
I will help you solve the first problem.
Square both sides:
Only one solution will work in this case
EDIT: DivideBy0 pointed out a spot that wouldn't work, which I suspected... grr